source4/libnet/libnet_lookup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Rafal Szczesniak 2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 /*
  21   a composite function for name resolving
  22 */
  23
  24 #include "includes.h"
  25 #include "libnet/libnet.h"
  26 #include "libcli/composite/composite.h"
  27 #include "auth/credentials/credentials.h"
  28 #include "libcli/resolve/resolve.h"
  29 #include "libcli/finddc.h"
  30 #include "libcli/security/security.h"
  31 #include "librpc/gen_ndr/ndr_lsa_c.h"
  32 #include "param/param.h"
  33
  34 struct lookup_state {
  35         struct nbt_name hostname;
  36         const char *address;
  37 };
  38
  39
  40 static void continue_name_resolved(struct composite_context *ctx);
  41
  42
  43 /**
  44  * Sends asynchronous Lookup request
  45  *
  46  * @param io arguments and result of the call
  47  */
  48
  49 struct composite_context *libnet_Lookup_send(struct libnet_context *ctx,
  50                                              TALLOC_CTX *mem_ctx,
  51                                              struct libnet_Lookup *io)
  52 {
  53         struct composite_context *c;
  54         struct lookup_state *s;
  55         struct composite_context *cresolve_req;
  56         struct resolve_context *resolve_ctx;
  57
  58         /* allocate context and state structures */
  59         c = composite_create(mem_ctx, ctx->event_ctx);
  60         if (c == NULL) return NULL;
  61
  62         s = talloc_zero(c, struct lookup_state);
  63         if (composite_nomem(s, c)) return c;
  64
  65         c->private_data = s;
  66
  67         if (io == NULL || io->in.hostname == NULL) {
  68                 composite_error(c, NT_STATUS_INVALID_PARAMETER);
  69                 return c;
  70         }
  71
  72         /* parameters */
  73         s->hostname.name   = talloc_strdup(s, io->in.hostname);
  74         if (composite_nomem(s->hostname.name, c)) return c;
  75
  76         s->hostname.type   = io->in.type;
  77         s->hostname.scope  = NULL;
  78
  79         /* name resolution methods */
  80         if (io->in.resolve_ctx) {
  81                 resolve_ctx = io->in.resolve_ctx;
  82         } else {
  83                 resolve_ctx = ctx->resolve_ctx;
  84         }
  85
  86         /* send resolve request */
  87         cresolve_req = resolve_name_send(resolve_ctx, s, &s->hostname, c->event_ctx);
  88         if (composite_nomem(cresolve_req, c)) return c;
  89
  90         composite_continue(c, cresolve_req, continue_name_resolved, c);
  91         return c;
  92 }
  93
  94
  95 static void continue_name_resolved(struct composite_context *ctx)
  96 {
  97         struct composite_context *c;
  98         struct lookup_state *s;
  99
 100         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 101         s = talloc_get_type(c->private_data, struct lookup_state);
 102
 103         c->status = resolve_name_recv(ctx, s, &s->address);
 104
 105         composite_done(c);
 106 }
 107
 108
 109 /**
 110  * Waits for and receives results of asynchronous Lookup call
 111  *
 112  * @param c composite context returned by asynchronous Lookup call
 113  * @param mem_ctx memory context of the call
 114  * @param io pointer to results (and arguments) of the call
 115  * @return nt status code of execution
 116  */
 117
 118 NTSTATUS libnet_Lookup_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 119                             struct libnet_Lookup *io)
 120 {
 121         NTSTATUS status;
 122         struct lookup_state *s;
 123
 124         status = composite_wait(c);
 125         if (NT_STATUS_IS_OK(status)) {
 126                 char **address;
 127
 128                 s = talloc_get_type(c->private_data, struct lookup_state);
 129
 130                 address = str_list_make_single(mem_ctx, s->address);
 131                 NT_STATUS_HAVE_NO_MEMORY(address);
 132                 io->out.address = discard_const_p(const char *, address);
 133         }
 134
 135         talloc_free(c);
 136         return status;
 137 }
 138
 139
 140 /**
 141  * Synchronous version of Lookup call
 142  *
 143  * @param mem_ctx memory context for the call
 144  * @param io arguments and results of the call
 145  * @return nt status code of execution
 146  */
 147
 148 NTSTATUS libnet_Lookup(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 149                        struct libnet_Lookup *io)
 150 {
 151         struct composite_context *c = libnet_Lookup_send(ctx, mem_ctx, io);
 152         return libnet_Lookup_recv(c, mem_ctx, io);
 153 }
 154
 155
 156 /*
 157  * Shortcut functions to find common types of name
 158  * (and skip nbt name type argument)
 159  */
 160
 161
 162 /**
 163  * Sends asynchronous LookupHost request
 164  */
 165 struct composite_context* libnet_LookupHost_send(struct libnet_context *ctx,
 166                                                  TALLOC_CTX *mem_ctx,
 167                                                  struct libnet_Lookup *io)
 168 {
 169         io->in.type = NBT_NAME_SERVER;
 170         return libnet_Lookup_send(ctx, mem_ctx, io);
 171 }
 172
 173
 174
 175 /**
 176  * Synchronous version of LookupHost call
 177  */
 178 NTSTATUS libnet_LookupHost(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 179                            struct libnet_Lookup *io)
 180 {
 181         struct composite_context *c = libnet_LookupHost_send(ctx, mem_ctx, io);
 182         return libnet_Lookup_recv(c, mem_ctx, io);
 183 }
 184
 185
 186 /**
 187  * Sends asynchronous LookupDCs request
 188  */
 189 struct tevent_req *libnet_LookupDCs_send(struct libnet_context *ctx,
 190                                          TALLOC_CTX *mem_ctx,
 191                                          struct libnet_LookupDCs *io)
 192 {
 193         struct tevent_req *req;
 194         struct finddcs finddcs_io;
 195
 196         ZERO_STRUCT(finddcs_io);
 197
 198         if (strcasecmp_m(io->in.domain_name, lpcfg_workgroup(ctx->lp_ctx)) == 0) {
 199                 finddcs_io.in.domain_name = lpcfg_dnsdomain(ctx->lp_ctx);
 200         } else {
 201                 finddcs_io.in.domain_name = io->in.domain_name;
 202         }
 203         finddcs_io.in.minimum_dc_flags = NBT_SERVER_LDAP | NBT_SERVER_DS | NBT_SERVER_WRITABLE;
 204         finddcs_io.in.proto = lpcfg_client_netlogon_ping_protocol(ctx->lp_ctx);
 205         finddcs_io.in.server_address = ctx->server_address;
 206
 207         req = finddcs_cldap_send(mem_ctx, &finddcs_io, ctx->resolve_ctx, ctx->event_ctx);
 208         return req;
 209 }
 210
 211 /**
 212  * Waits for and receives results of asynchronous Lookup call
 213  *
 214  * @param c composite context returned by asynchronous Lookup call
 215  * @param mem_ctx memory context of the call
 216  * @param io pointer to results (and arguments) of the call
 217  * @return nt status code of execution
 218  */
 219
 220 NTSTATUS libnet_LookupDCs_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 221                                struct libnet_LookupDCs *io)
 222 {
 223         NTSTATUS status;
 224         struct finddcs finddcs_io;
 225         status = finddcs_cldap_recv(req, mem_ctx, &finddcs_io);
 226         talloc_free(req);
 227         io->out.num_dcs = 1;
 228         io->out.dcs = talloc(mem_ctx, struct nbt_dc_name);
 229         NT_STATUS_HAVE_NO_MEMORY(io->out.dcs);
 230         io->out.dcs[0].address = finddcs_io.out.address;
 231         io->out.dcs[0].name = finddcs_io.out.netlogon->data.nt5_ex.pdc_dns_name;
 232         return status;
 233 }
 234
 235
 236 /**
 237  * Synchronous version of LookupDCs
 238  */
 239 NTSTATUS libnet_LookupDCs(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 240                           struct libnet_LookupDCs *io)
 241 {
 242         struct tevent_req *req = libnet_LookupDCs_send(ctx, mem_ctx, io);
 243         return libnet_LookupDCs_recv(req, mem_ctx, io);
 244 }
 245
 246
 247 struct lookup_name_state {
 248         struct libnet_context *ctx;
 249         const char *name;
 250         uint32_t count;
 251         struct libnet_DomainOpen domopen;
 252         struct lsa_LookupNames lookup;
 253         struct lsa_TransSidArray sids;
 254         struct lsa_String *names;
 255
 256         /* information about the progress */
 257         void (*monitor_fn)(struct monitor_msg *);
 258 };
 259
 260
 261 static bool prepare_lookup_params(struct libnet_context *ctx,
 262                                   struct composite_context *c,
 263                                   struct lookup_name_state *s);
 264 static void continue_lookup_name(struct composite_context *ctx);
 265 static void continue_name_found(struct tevent_req *subreq);
 266
 267
 268 struct composite_context* libnet_LookupName_send(struct libnet_context *ctx,
 269                                                  TALLOC_CTX *mem_ctx,
 270                                                  struct libnet_LookupName *io,
 271                                                  void (*monitor)(struct monitor_msg*))
 272 {
 273         struct composite_context *c;
 274         struct lookup_name_state *s;
 275         struct tevent_req *subreq;
 276         bool prereq_met = false;
 277
 278         c = composite_create(mem_ctx, ctx->event_ctx);
 279         if (c == NULL) return NULL;
 280
 281         s = talloc_zero(c, struct lookup_name_state);
 282         if (composite_nomem(s, c)) return c;
 283
 284         c->private_data = s;
 285
 286         s->name = talloc_strdup(c, io->in.name);
 287         s->monitor_fn = monitor;
 288         s->ctx = ctx;
 289
 290         prereq_met = lsa_domain_opened(ctx, c, io->in.domain_name, &c, &s->domopen,
 291                                        continue_lookup_name, monitor);
 292         if (!prereq_met) return c;
 293
 294         if (!prepare_lookup_params(ctx, c, s)) return c;
 295
 296         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 297                                                ctx->lsa.pipe->binding_handle,
 298                                                &s->lookup);
 299         if (composite_nomem(subreq, c)) return c;
 300
 301         tevent_req_set_callback(subreq, continue_name_found, c);
 302         return c;
 303 }
 304
 305
 306 static bool prepare_lookup_params(struct libnet_context *ctx,
 307                                   struct composite_context *c,
 308                                   struct lookup_name_state *s)
 309 {
 310         const int single_name = 1;
 311
 312         s->sids.count = 0;
 313         s->sids.sids  = NULL;
 314
 315         s->names = talloc_array(s, struct lsa_String, single_name);
 316         if (composite_nomem(s->names, c)) return false;
 317         s->names[0].string = s->name;
 318
 319         s->lookup.in.handle    = &ctx->lsa.handle;
 320         s->lookup.in.num_names = single_name;
 321         s->lookup.in.names     = s->names;
 322         s->lookup.in.sids      = &s->sids;
 323         s->lookup.in.level     = 1;
 324         s->lookup.in.count     = &s->count;
 325         s->lookup.out.count    = &s->count;
 326         s->lookup.out.sids     = &s->sids;
 327         s->lookup.out.domains  = talloc_zero(s, struct lsa_RefDomainList *);
 328         if (composite_nomem(s->lookup.out.domains, c)) return false;
 329
 330         return true;
 331 }
 332
 333
 334 static void continue_lookup_name(struct composite_context *ctx)
 335 {
 336         struct composite_context *c;
 337         struct lookup_name_state *s;
 338         struct tevent_req *subreq;
 339
 340         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 341         s = talloc_get_type(c->private_data, struct lookup_name_state);
 342
 343         c->status = libnet_DomainOpen_recv(ctx, s->ctx, c, &s->domopen);
 344         if (!composite_is_ok(c)) return;
 345
 346         if (!prepare_lookup_params(s->ctx, c, s)) return;
 347
 348         subreq = dcerpc_lsa_LookupNames_r_send(s, c->event_ctx,
 349                                                s->ctx->lsa.pipe->binding_handle,
 350                                                &s->lookup);
 351         if (composite_nomem(subreq, c)) return;
 352
 353         tevent_req_set_callback(subreq, continue_name_found, c);
 354 }
 355
 356
 357 static void continue_name_found(struct tevent_req *subreq)
 358 {
 359         struct composite_context *c;
 360         struct lookup_name_state *s;
 361
 362         c = tevent_req_callback_data(subreq, struct composite_context);
 363         s = talloc_get_type(c->private_data, struct lookup_name_state);
 364
 365         c->status = dcerpc_lsa_LookupNames_r_recv(subreq, s);
 366         TALLOC_FREE(subreq);
 367         if (!composite_is_ok(c)) return;
 368
 369         c->status = s->lookup.out.result;
 370         if (!composite_is_ok(c)) return;
 371
 372         if (s->lookup.out.sids->count != s->lookup.in.num_names) {
 373                 composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
 374                 return;
 375         }
 376
 377         composite_done(c);
 378 }
 379
 380
 381 NTSTATUS libnet_LookupName_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 382                                 struct libnet_LookupName *io)
 383 {
 384         NTSTATUS status;
 385         struct lookup_name_state *s = NULL;
 386         struct lsa_RefDomainList *domains = NULL;
 387         struct lsa_TransSidArray *sids = NULL;
 388
 389         status = composite_wait(c);
 390         ZERO_STRUCT(io->out);
 391
 392         if (!NT_STATUS_IS_OK(status)) {
 393                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s",
 394                                                        nt_errstr(status));
 395                 goto done;
 396         }
 397
 398         s = talloc_get_type(c->private_data, struct lookup_name_state);
 399
 400         if (*s->lookup.out.count == 0) {
 401                 goto success;
 402         }
 403
 404         domains = *s->lookup.out.domains;
 405         sids = s->lookup.out.sids;
 406
 407         if (domains == NULL || sids == NULL) {
 408                 status = NT_STATUS_UNSUCCESSFUL;
 409                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s",
 410                                                        nt_errstr(status));
 411                 goto done;
 412         }
 413
 414         if (sids->count == 0) {
 415                 goto success;
 416         }
 417
 418         io->out.rid        = sids->sids[0].rid;
 419         io->out.sid_type   = sids->sids[0].sid_type;
 420         if (domains->count > 0) {
 421                 io->out.sid = dom_sid_add_rid(mem_ctx, domains->domains[0].sid,
 422                                               io->out.rid);
 423                 if (io->out.sid == NULL) {
 424                         status = NT_STATUS_NO_MEMORY;
 425                         goto done;
 426                 }
 427                 io->out.sidstr = dom_sid_string(mem_ctx, io->out.sid);
 428                 if (io->out.sidstr == NULL) {
 429                         status = NT_STATUS_NO_MEMORY;
 430                         goto done;
 431                 }
 432         }
 433
 434 success:
 435         io->out.error_string = talloc_strdup(mem_ctx, "Success");
 436 done:
 437         talloc_free(c);
 438         return status;
 439 }
 440
 441
 442 NTSTATUS libnet_LookupName(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 443                            struct libnet_LookupName *io)
 444 {
 445         struct composite_context *c;
 446
 447         c = libnet_LookupName_send(ctx, mem_ctx, io, NULL);
 448         return libnet_LookupName_recv(c, mem_ctx, io);
 449 }